FreeBSD web build failed on build-web.stream.freebsd.org

[User Www-data]

===> releases/10.0R
===> releng
===> search
===> search/opensearch
===> security
===> security/advisories
===> security/patches
===> snapshots
===> support
===> doc
===> doc/articles (all)
===> doc/articles/bsdl-gpl (all)
===> doc/articles/building-products (all)
===> doc/articles/casestudy-argentina.com (all)
===> doc/articles/committers-guide (all)
env XML_CATALOG_FILES="file:///home/www/build/head/en_US.ISO8859-1/articles/committers-guide/catalog-cwd.xml  file:///home/www/build/head/en_US.ISO8859-1/share/xml/catalog.xml  file:///home/www/build/head/share/xml/catalog.xml  file:///home/www/build/head/share/xml/catalog-common.xml  file:///usr/local/share/xml/catalog" /usr/local/bin/xmllint --nonet --noent --valid --dropdtd --xinclude /home/www/build/head/en_US.ISO8859-1/articles/committers-guide/article.xml > article.parsed.xml.tmp
/home/www/build/head/en_US.ISO8859-1/articles/committers-guide/article.xml:1142: parser error : Opening and ending tag mismatch: screen line 1141 and sect4
	</sect4>
	        ^
/home/www/build/head/en_US.ISO8859-1/articles/committers-guide/article.xml:1453: parser error : Opening and ending tag mismatch: sect4 line 1121 and sect3
      </sect3>
              ^
/home/www/build/head/en_US.ISO8859-1/articles/committers-guide/article.xml:1945: parser error : Opening and ending tag mismatch: sect3 line 1046 and sect2
    </sect2>
            ^
/home/www/build/head/en_US.ISO8859-1/articles/committers-guide/article.xml:1980: parser error : Opening and ending tag mismatch: sect2 line 934 and sect1
  </sect1>
          ^
/home/www/build/head/en_US.ISO8859-1/articles/committers-guide/article.xml:4628: parser error : Opening and ending tag mismatch: sect1 line 266 and article
</article>
          ^
/home/www/build/head/en_US.ISO8859-1/articles/committers-guide/article.xml:4629: parser error : Premature end of data in tag article line 6

^
*** [article.parsed.xml] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1/articles/committers-guide.
*** [all] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1/articles.
*** [all] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1.
*** [all-all] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1/htdocs/doc.
*** [all] Error code 1

Stop in /home/www/build/head/en_US.ISO8859-1/htdocs.
        4.39 real         2.02 user         2.48 sys